Question $3(1$ point$)$

PGPS implementation: select all true statements

a flow is backlogged in a time interval, this flow receives at least its fair share service, and may be more, during this interval

a flow is backlogged as long as it has a packet waiting for transmission when the first packet arrives for a flow after the flow was idle, the set of backlogged remains the same

when the second packet arrives for a flow after the flow was idle, the set of backlogged has a new addition, that is$,$ this flow

a flow may be backlogged long after all packets from this flow have been transmitted